JP2533767Y2 - Thermal transfer recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] This invention relates to a thermal transfer recording medium, and more specifically, has a configuration in which a long ink film used for a bar code printer, a video printer, a facsimile, etc. is wound around a core. The present invention relates to a thermal transfer recording medium.

[Related Art] In recent years, a thermal transfer recording method has features such as low noise, low cost, maintenance-free, and small size and light weight, and thus has been used in many fields such as a barcode printer, a video printer, and a facsimile. .

By the way, conventionally, the thermal transfer recording medium is the fourth type.
As shown in the drawing, a structure in which the core 1 and the ink film 2 are bonded together using an adhesive tape 3 or the like is general, but in this structure, when the ink film 2 is finished,
There is a problem that the ink film 2 is not separated from the core 1 and a load is applied to the take-up motor, causing a failure in the motor. Further, even when the ink film 2 is separated from the core 1, there is a problem that if the adhesive force is large, the impact at the moment of the breakage is large, which causes a failure of the printer.

Further, in the manufacturing process of the thermal transfer recording medium, a long and wide ink film is wound around the core while being slit into an appropriate width. At this time, if the adhesive strength of the adhesive portion is too weak, the adhesive portion peels off. It was often observed that the ink film could not be wound on the core.

[Problems to be solved by the invention]

According to this invention, the ink film and the core can be securely wound without peeling off at the time of the slit, and the ink film and the core are separated smoothly at the end of the ink film after printing, so that thermal transfer recording that does not apply a load to the printer. It provides a medium.

[Means for solving the problem]

The present invention is based on the fact that, in a thermal transfer recording medium in which a long ink film is wound around a core, a portion where the ink film and the core are in contact with each other is formed by repeating an adhesive portion and a non-adhesive portion in a circumferential direction of the core. Features.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 shows an example of a thermal transfer recording medium according to the present invention.
A plurality of bonded portions and non-bonded portions are provided alternately. In the figure, reference numerals 41, 42, and 43 denote bonded portions, and reference numeral 5 denotes a non-bonded portion.

Now, looking at the end of the ink film after printing, the moment when the core 1 and the ink film 2 separate from each other is as follows.
As shown in FIG. 2, the ink film 2 does not exist in the tangential direction with respect to the core 1 but sticks slightly inward. At this time, the area of the bonding portion 41 in the figure is reduced, and the bonding strength is 0.5 kgf or less (preferably 0.01 to 0.5 kF).
If gf) is set, the ink film 2 can be easily separated from the core 1 by the bonding portion 41. Further, there are a plurality of bonding portions 42, 43,... Having the same or substantially the same bonding strength as the bonding portion 41, and the non-bonding portion 5 is present between the bonding portions 42 and the bonding portions 43 and the like. If the ink film 2 is continuously pulled in the direction of the arrow after the bonding portion 41 is separated, the bonding portions 42, 43,... With the same force can be separated. Therefore, the core 1 and the ink film 2 can be easily separated from a commercially available printer without imposing an abnormal load on a motor or the like.

Means for forming the bonding portions 41, 42, 43 ... having a bonding strength of 0.5 kgf or less include fusion of the ink film and the core by heating,
Various methods can be used in consideration of the adhesive area, such as use of a double-sided adhesive tape, glue, an adhesive, and the like.

In the thermal transfer recording medium of this invention, the core is rotated in the direction in which the ink film is wound without changing the position of the core, with the end of the ink film opposite to the portion in contact with the core fixed in the length direction of the ink film. When a force is applied, it is desirable that the tension of the ink film immediately before the ink film and the core separate from each other is larger than 0.5 kgf. This is because the ink film 2 is wound around the core 1 in a state where the ink film 2 exists in a tangential direction to the core 1 at the time of slitting in the thermal transfer recording medium manufacturing process, as shown in FIG. This is because it is effective to prevent the ink film 2 and the core 1 from being separated from each other due to insufficient bonding strength at only one portion where the bonding portion 41 is bonded, so that the winding becomes impossible. .

The ink film 2 at the time of this slit has a plurality of bonding portions 4
The presence of 1,42,43,44... Increases the bonding strength in proportion to the number of bonding portions (total bonding area), so that the ink film can be wound up without separating the ink film and the core.

As a means for solving the problem in the present invention, it has been proposed that the adhesive strength between the ink film and the core be 1 kgf or less (Japanese Patent Application Laid-Open No. 64-75275).
However, since the bonding part here is one place, the bonding strength is
At a value close to 1 kgf, the ink film peels from the core, but it is inevitable to apply a considerable load to the motor, etc.
Further, when the ink film is wound on the core at the time of slitting, there may be a disadvantage that the adhesive portion on the winding side core peels off and cannot be wound.

〔Example〕

Example 1 A general paper tube (an outer diameter of 33 mm, a spiral wound paper)
100mm length) as a core, and about 4.5μm thick
An ink film provided with an ink layer having a thickness of about 3.5 μm on a PET film was wound so that the ink layer side was inside. At this time, each bonded part shown in FIG.
And heat-fused only at the bonding portion (4 locations in total) at 100 ° C. for 5 seconds so that the distance between the bonding portions was 8 mm. Thereafter, the ink film was wound 100 m to obtain a thermal transfer recording medium. The bonding strength of each bonding portion was 0.2 kgf.

Example 2 A vinyl chloride tube (outside diameter 33 mm, length 100 mm) was used as a core,
The same ink film as in Example 1 was wound around this core. At this time, 4mm x 100mm
Using a double-sided tape made by Nitto Co., Ltd., glue all three places at 6mm intervals, then apply the ink film
Winding was performed for 100 m to obtain a thermal transfer recording medium. The bonding strength of each bonding portion was 0.4 kgf.

Comparative Example 1 Example 1 except that the number of bonded portions was changed to one.
In the same manner as in the above, a thermal transfer recording medium was obtained.

Comparative Example 2 A thermal transfer recording medium was obtained in the same manner as in Example 2, except that the double-sided tape was adhered to only one place with a size of 8 mm × 100 mm.
The bonding strength of the bonding portion was 0.7 kgf.

Comparative Example 3 A thermal transfer recording medium was obtained in the same manner as in Comparative Example 2, except that the size of the double-sided tape was changed to 50 mm × 100 mm. The bonding strength of the bonding portion was 4.0 kgf.

In winding the ink film around the core in the slit process at the time of manufacturing these five types of thermal transfer recording media, the number of ink films and cores that were separated and could not be wound was evaluated based on the percentage of defectives out of 100. Further, using a motor having a winding force of 3.0 kgf, the test was performed to determine whether the ink film was easily peeled off the core. Table 1 shows the results.

[Effects of the Invention] As is clear from the description of the embodiment, according to the thermal transfer recording medium of the invention, the ink film and the core are smoothly separated at the end of the ink film after printing, so that no load is applied to the printer, and the slit is formed. At times, the ink film and the core can be reliably wound without peeling.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a thermal transfer recording medium according to the present invention. FIG. 2 is a view for explaining the moment when the core and the ink film are separated after printing is completed. FIG. 3 is a diagram for explaining the relationship between the core and the ink film when the thermal transfer recording medium is slit (taken up). FIG. 4 is a diagram schematically showing a conventional thermal transfer recording medium. 1 ... Core, 2 ... Ink film 3 ... Adhesive tape, 5 ... Non-adhesive part 41,42,43 ... Adhesive part

Claims (2)

(57) [Scope of request for utility model registration] 1. A thermal transfer recording medium in which a long ink film is wound around a core, wherein a portion where the ink film and the core are in contact with each other is constituted by repeating a bonded portion and a non-bonded portion in the circumferential direction of the core. A thermal transfer recording medium characterized by the following. 2. The thermal transfer recording medium according to claim 1, wherein the adhesive strength of each of said adhesive portions is 0.5 kgf or less.